In Indonesia, a Sumatran orangutan named Rakus healed a large wound on his cheek by self-medicating with a paste made from plants. This is the first time a wild animal has been recorded treating an injury using a medicinal plant. Scientists believe this behavior could come from a common ancestor shared by humans and great apes, highlighting our similarities. Rakus chewed the leaves of a plant called Akar Kuning, an anti-inflammatory and anti-bacterial plant, to create a paste that healed his wound in a month. The researchers noted that Rakus knew he was applying medicine due to the intentional and lengthy process, suggesting impressive medical skills in orangutans.
https://www.bbc.co.uk/news/science-environment-68942123